Revision History for SIR 2010-5090-H Gilpin R. Robinson, Jr., and W. David Menzie Economic Filters for Evaluating Porphyry Copper Deposit Resource Assessments Using Grade-Tonnage Deposit Models, with Examples from the U.S. Geological Survey Global Mineral Resource Assessment ----------------------------------------------------- Posted online November 1, 2012 ----------------------------------------------------- Revised and reposted May 10, 2013, version 1.1 On page 16, equation 15, replaced (1-EDF) with (1-MC sub 0)(1-EDF) ----------------------------------------------------- Revised and reposted March 31, 2014, version 1.2 Tables 7 and 8 and 10 through 13 had minor changes and were replaced.